Evidences of possible necrotic-core artifact around dense calcium in Virtual Histology images

Abstract

Virtual Histology (VH) is a new medical imaging technique that allows the assessment of atherosclerotic plaque composition, a potential useful tool for the evaluation of individuals with coronary disease. Empirical observation has suggested that plaque areas adjacent to dense calcium (DC) are frequently coded as necrotic core (NC) in VH images. The main objective of the study was to evaluate whether the presence of DC induces an artifactual coding of NC in adjacent structures. To test this effect, a set of 89 coronary arteries segments have been analyzed in baseline and after stent implantation, which are coded as dense calcium into VH images. Necrotic tissue has risen significantly after stenting, especially in regions surrounding dense calcium structures, reinforcing the hypothesis of an artifactual relationship between those plaque components.

A New Approach for Improving Coronary Plaque Component Analysis Based on Intravascular Ultrasound Images

“…This phenomenon was caused by similarities between NC and CA in gray-level IVUS images. This fact supports the previous studies, which have shown that plaque areas adjacent to dense calcium are frequently coded as necrotic tissue in VH images (Sales et al, 2008). By considering selected cross-sections that contained plaque areas with a homogeneous tissue composition as reported in (Gonzalo et al, 2008), the accuracy results can be increased significantly.…”